We received two MARC records for Experimental Mechanics (Springer) in this month’s batch load. Why, I don’t know. I sent an email to EBSCO’s A-to-Z folks pointing it out. This has happened before and that investigation is still ongoing. I can’t say how frequently this happens because I only notice the titles that I’m checking up on after the MARC upload. (And I doubt my changes are connected to the duplicate record.)
I’ll post any explanation I receive from the A-to-Z staff. With the previous duplicate still being investigated, I’m not sure I’ll get an answer right away.